Police have arrested a 19-year-old man who’s been identified as a “person of interest” in the murder of Brownsville museum director Barry Horn, The Brownsville Herald reports. Ernesto Ivan Martinez previously lived with the 59-year-old Horn and they are believed to have been lovers until a recent falling out, according to Action 4 News (Valley Central.com). Horn was found stabbed to death at his Brownsville home over the weekend, and police say there were signs of a struggle. Horn’s vehicle and other personal items were missing from the home. Martinez was taken into custody on Monday by border patrol officers at the B&M International Bridge. He is currently charged with felony auto theft. Horn was the executive director of the Brownsville Museum of Fine Art, and a scholarship has been established in his name at the University of Texas at Brownsville and Texas Southmost College, where he worked for many years.